可用带宽是重要的网络资源，但它的实际测量存在许多困难。
Available bandwidth is one of the important network resources, but it difficult to measure in practice.
网络多媒体系统中，需要对可用带宽进行主动测量，但测试流会妨碍数据传输质量。
In networked multimedia systems, the probing traffic generated by active measurement of available bandwidth might interfere with the audio-visual communications.
网络多媒体系统中，需要对可用带宽进行主动测量，但测试流会妨碍数据传输质量。
In networked multimedia systems, the probing traffic generated by active measurement of available bandwidth might interfere with the audio-visual communications.
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